![]() The filter paper can be cut into small strips and stored in a desiccator with dry silica gel. ![]() Soak filter paper in this solution, drain and dry in an oven (set at no more that 100 ☌), so that it is a definite blue colour.Dissolve 5 g of hydrated cobalt(II) chloride in 100 cm 3 of water (solution is TOXIC).The indicator papers should be handled as little as possible and hands washed after use. A folded cone of paper used as a funnel may be helpful for this. Carefully pour about 3 g of ammonium dichromate(VI) into a 1000 cm 3 conical flask so that it forms a small heap in the center. Cobalt chloride (TOXIC, DANGEROUS FOR THE ENVIRONMENT, may cause SENSITISATION) – see CLEAPSS Hazcard HC025 and CLEAPSS Recipe Book RB030. Confirm that this is water with the blue cobalt chloride paper.Read our standard health and safety guidance.Hexahydrate cobalt(II) chloride CoCl 2♶H 2O (TOXIC, DANGEROUS FOR THE ENVIRONMENT, SENSITISER ), 5 g.The hexahydrate is deep purple in color, whereas the anhydrous form is pale blue. Cobalt chloride paper is useful because the hydration/dehydration reaction occurs readily making the paper an indicator for water. It is usually supplied as the hexahydrate CoCl 2♶H 2O. Our Cobalt Chloride Test Paper can quickly and economically measure the presence of relative humidity in the atmosphere The paper is directly exposed to the. You can use the papers to test for the presence of water, where the colour changes from blue to pink.Ĭobalt(II) chloride is an inorganic compound of cobalt and chlorine, with the formula CoCl 2. This resource provides instructions for preparing your own cobalt chloride indicator papers. RSC Yusuf Hamied Inspirational Science Programme.Introductory maths for higher education.The physics of restoration and conservation. ![]()
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